Work holder for brush machines



Oct. 9, 1928. 1,687,250

c. JOBST WORKHOLDER FOR BRUSH MACHINES Filed April 1, 1924 2 Sheets-Sheet 1 WW0 4M1 mad; W anmmw fl Oct. 9, 1928.

C. JOBST WORKHOLDER FOR BRUSH MACHINES Filed April 1, 1924 2 Sheets-Sheet 2 Patented Oct. 9, 19 28.

UNITED STATES 1,687,250 PATENT OFFICE.)

CONRAD J'OBST, TOLEDO, OHIO, ASSIGNQR TO THE TOLEDO AUTOMATIC BRUSH MACHINE 00., OFITOLEDO, OHIO, A CORPORATION OF OHIO.

HOLDER FOR BRUSH MACHINES.

Application filed April 1, 1924. 'Serial in. 703,375.

The invention relates tomanufacture' of brushes by automatic machines and has for its primary object the obtaining of a higher output and better quality in the product. In the present state of the art it is usual to provide automatic brush machines w th duplicate work holders, in one of which the brush backs are successively bored, while in the other the tuftsare set in a previously bored back. WVith such constructions the drilling of the hole and setting of the tuft must be performed in the same time interval and the slowing of either operation limits the output of the machine.

With the improvements in the construction of tuft setting mechanism the time required for the setting of each tuft has been greatly reduced, so that it is difficult to bore a hole in such interval. This results in imperfect bores and is destructive to the drills "which are used, and valuable time is lost in resharpening and replacing such drills.

Y The present invention overcomes the difliculties by segregating the drilling andtuft setting operations and performing the same in separate machines. Thus the boring may be performed by comparatively slow feeding multiple drills, which will produce a better quality'of Work without injury to the tools. (hi the other hand the tuft setting mechanism is not limited by any other operation, which. permits of greatly increasing its speed and output. However, such method s only possible where the holes in the previously, bored brush backs are'successively exactly registered with the tuft setting mechanism. Such exact registration is secured by the improved construction of work carrier, which forms the subject matter of the present invention. A further improvement is that the work carrier permits engagement and disengagement of the work in the process of brush making. such as drilling the brush backs,setting the tufts, etc., there is specifically described only the construction adapted for use in tuft setting. Essentially theconstruction comprises a carrier having an endless series of work position devices thereon together with means for intermittently advancing said carrier both rotatively and axially and for securing in each step of advancement exactly predetermined registration. More specifically the machine comprises a floating drum carrier.

' which is axiallyadjusted step by step into a I series of successive positions,.is guided during such advancement through a predetermined path and is, rotatively advanced intermediate successive series. This permits of setting the tufts in adj acent rows, which may be either parallel or non-parallel and which may be spaced aspredetermined. 1

As shown inthe drawings, A is a suitable base provided with a vertically extending hollow standardB within which is concentrically arranged ,a vertically adjustable member Q. The latter is also preferably.

hollow, but is providedat its upper end with a head D carrying an 'upwardly extending spindle E. The member. C is guided in its vertical movement, preferably by arranging in the annular space between the same and the hollow standard B aseries of spaced pairs of vertically grooved guideways F withballs Gr arranged therebetween. These restrict the movement of the member C rela tive to the base. A to a non-'rotative axial movement.

Surrounding the standard '13 and journaled thereon is a rotative drum member H which has its upper end fashioned to form a stepped cam H' This cam is in engagement with a hearing I on the. member C, preferably a roller, which is mounted at the outer end of a radially extending pin 1 se cured in a projecting boss I on said member C. The arrangement s such that when the member H is rotated, the memberC will be raised or lowered step by step through, a series of predetermined positions. The steps of the cam Hf. are ofsufiicient length to cause the drum carrier M to remain stationary momentarily while the brush back is being operated upon. The member H is revolved through the medium of a bevel gear. ring J which is in mesh with the bevel pinion K on M therebetween. The member M hereinafter referred to as the drum carrier is thus free to revolve upon the spindle, but is frictionally engaged with the rotative member H through the medium of a contact member N shown as a spring-pressed plunger located in a recess in said member H. Thus when not held from movement, the drum carrier M will be frictionally driven with and re v'o'lved by the member H. The drum carrier M is divided by a central groove portion 0 into upper and lower rings 0 and 0 The upper ring is provided with aseries of work engaging devices, each comprising transversely arranged locating shoulders and yieldable clamps. Where, as designed, the workto be held in each clamp is a tooth brush back, the portion 0" is vertically grooved to form a series of tapering undercut locating ribs P, While a flange P in the groove 0 beneath the portion 0" forms a series of locating end bearings. Adjacent to each rib P is a radially inwardly extending groove P containing a series of radially extending spring fingers P for engaging one edge of the tooth brush back and pressing the same towards the next adjacent rib. This construction permits of rapidly inserting the brush backs by a downward move-.

ment between the rib P and spring fingers P until the lower end of the back contacts with the flange P. When thus engaged the back will be firmly held against the drum and in position for exact registration. Also as the ribs are undercut and the fingers slightly curved, the brush back will be drawn in" Contact with the drum.

The portion 0 of the drum carrier M is formed with a series of vertically extending guideways Q, preferably grooves, and these grooves are arranged in groups vertically opposite each of the brush backs in the retaining clamps. In the forming of tooth brushes it is usual to arrange the tufts in non-parallel rows, being closer to each other at the outer end and spreading apart in the direction of the handle. To produce such rows the guide grooves Q in each group are non-parallel, as indicated at Q, Q and Q so that by successively engaging said guide grooves with a cooperating detent the success'ive vertical re'cipro'cations of thedrum carrier M will be parallel to the respective grooves.

The cooperating detent R is of a wedgeshape form and is yieldably pressed into the,

The'suc'cessive 'dis'engagements of the detent- R are sotimed as to occur at the end-of each series of vertical steps formed on the cam H. This timing mechanism as shown comprises one or more dogs S on the shaft L, which during the rotation of said shaft will periodically press "against a bearing S on a slide S which carries the detent B. This slide S engages bearings T ina standard T on the base A while a spring, U serves to yiel'dably press the slide in a direction counter to its movement by the detent S.

The weight of the drum carrier M is prefs erab'ly partially counterbalanced by suitable means such the cord or cable V attached to the member C and passing over a pulley"V- and downward to a counterweight V In operation the machine is placed in con nection with any suitable construction of tuft setting mechanism, the discharge nozzle W of which is in a fixed line registering with one of the holes in one of the brush backs. The mechanism of the tuft setting machine is so timed with the rotation of the shaft L that one tuft is set during each interval of rest intermediate the step-by-step movement of the drum carrier Thus the tufts will be set in successive rows in the same brush back and succeeding brush backs, the operation being continuous. The brushes when completed can be easily withdrawn fromthe holding clamps and new brush backs inserted in place thereof, this being performed while the machine is in continuous operation. Thus the capacity of the tufting machine is greatly in creased and no time is wasted for the insertion or removal of the work. Furthermore, exact registration is obtained, this being due: first,to the fact that each brush back is exactly located in its clamping holder; second the cam for moving the carrier axially is pr0- vided with parallel steps with exact intervals therebetween third, the guides Q, Q, and Q give exact registration to the successive steps in each row.

.One important feature of the construction is the non-positive driving connection for rotatively advancing the drum carriers. This is due to the friction drive produced by the shoe or spring-pressed plunger N and the friction is so limited that the drum may be arrested by the detent R. Such a construction dispenses with means for exactly dividing the movement, but nevertheless secures exact registration.

What I claim as my invention is:

Kim

1. In a brush machine, a vertically adjustable journal bearing, a drum carrier mounted on said bearing for rotation about a fixed axis, a cam revoluble about the same axis provided with a series of parallel steps of exactly predetermined spacing comprising alternate series respectively ascending and descending, means for non-positively rotat- I 2. In a brush machine, a vertically adjustable journal bearing, a drum carrier mounted on said bearing for rotation about a fixed axis, a series of parallel Work holders on the periphery of said drum carrier adapted for the quick attachment and detachment of the work, a stepped cam concentric with the axis of said carrier for imparting an intermittent step by step axial movement to said bearing and carrier, said steps being alternately in ascending and'descending series, a series of guides on said carrier for exactly predetermining the direction of movement during the ascending and descending series of steps, a cooperating member for engaging said guides, means for non-positively rotating said carrier, and means for intermittently disengaging'said cooperating means from said guides to permit the rotative advancement of said carrier from one guide to another.

3. In a brush machine, a rotatable drum carrier, a continuously moving friction member continuously engaging said carrier, means engaging said carrier to prevent rotation thereof and means for releasing said first mentioned means whereby said carrier is rotatably adjusted.

4. In a brush machine, a rotatable drum carrier, a series of guideways formed on the periphery of said carrier, a continuously and to maintain said carrier stationary in exactly predetermined position when engaging said steps, and means for controlling carrier corresponding to the rows in said carrier in the transverse direction along a predetermined path.

6. In a brush machine, the combination with a carrier mounted for both rotative and axial movements,.of a cam having aseries of steps thereon with intermediate inclines, a cam follower engaging said cam adapted to cooperate therewith to axially move said carrier, means'for urging said carrier in one direction, a stop for preventing rotation of said carrier, a series of now parallel guideways on'said carrier cooperating with said stop to guide said carrier through a predetermined path during the axial movement thereof, and means for periodically disengaging said stop "from its cooperating guideway whereby the next successive guideway on said carrier is engaged.

7. In a brush machine, the combination with a base, of an endless carrier mounted for movement in an endless circuit and also for a transverse move1nent,-the axis of said carrier being at all times fixed relative to saidbase, a series of brush back holders mounted on. said carrier and adapted to receive brush backs having a series of rows of holes therein, means forcontinuously urgs ing said carrier in one direction of its endless circuit, a series of guideways on said salt brush backs, a stop cooperating with said guidways to determine the adjustment of said carrierin its endless circuit, means for axially adjusting said carrier step by step, and means for radially withdrawing said stop from said guideways upon the completion of each row, whereby said carrier is moved into position for'the next succeeding row.

8. In a brush machine, the combination with a cylindrical standard, of an axially movable member slidable within said standard and non-rotatably secured thereto, a carrier surrounding said standard and rotatably supported by said axially'movable member, means for imparting an intermittent axial movement to said member, and means for rotating said carrier.

9. In a brush machine, the combination with a cylindrical carrier having a series of work holders arranged circumferentially thereof, each adapted to hold a brush back having rows of holes therein, a series of guideways on said carrier corresponding -to the rows of holes in each brush and successive brushes, means for imparting a continu- 1ng said standard, a non-rotatable member ltd exactly predetermined adapted to be axially moved therewith, said carrier having a cylindrical portion surrounding said cam, and means for rotating said cam.

11. In a brushmachine, the combination with a cylindrical standard, of a tubular revoluble cam surrounding said standard, means for continuously rotating said cam, an axially movable member slidable within said standard and non-rotatably secured thereto, a-cam follower carried by said memberand engaging said cam, a carrier supported on said axially movable member, to move therewith, said carrier being journaled on said member and being provided with adepending annular flange surrounding said cam, non-positive driving means between said cam and said depending flange for imparting a continuous torque to the latter, a series of guides circumferentially spaced on said carrier, and a stop adapted to intermittently engage the successive guides.

12. In a brush machine, the combination with a, carrier mounted for axial and rotative movements, of a cylindrical cam journaled concentrically with said carrier and having one end thereof provided with a series of parallel steps and intermediate inclines, a cam follower associated with said carrier and engaging said cam to axially adjust said carrier, means for continuously rotating said cam, and means for; rotatably adjusting said carrier.

13. In a brush machine, the combination of a drum carrier, a circumferential series of brush back holders mounted on the periphery of saidcarrier, a mounting for said carrier constraining the same to axial and rotative movements, means for imparting axial step-by-step movements tosaid carrier means independent of the first mentioned means for imparting exactly predetermined rotative step-bystep movementscomprising-a series of guides on the periphery of said drum carrier ex,- tending longitudinally thereof,,a detent enone of said guides, means for continuously urging said carrier rotatively, and means for momentarily withdrawing said; detent from said guide and reengaging the same with the adjacent guide.

14. In a brush machine, the combination with an endless carrier mounted for movement in an endless circuit and also for movement transverse thereto, of a series of brush back holders circumferentially spaced on said endless carrier, a series of guides on said carrier spaced circumferentially thereof each guide extending in a direction exactly corresponding. to a row of holes in the brush, back pattern, meansfor imparting a step-by-step movement to, said; carrier in; a

direction transverse, to said' endless circuit, means for continuously urging said earner;

in one direction of its endless-circuit, a stop;

engaging oneof said guides throughout-the entire step-by-step movement in one direce t on, and means for; momentarily radially withdrawing said stop'f'rom said guide and. reengaging the same with the adJacent guide after a predetermined number of said stepby-step' movements. r i

15. In a machine for making: tooth brushes having a plurality of longitudinally extending non-parallel; rows of tufts, the combination of a cylindrical drum, a mounting for said drum constraining the same to axial; and rotational movements, a circumferentialseries of tooth brush holders on the periphery of said drum, said-drum being of; such large diameter relative to the width of the tooth brush that the tufts in the outer rows extend substantially parallelto each other,

means for imparting an axial step-by-step movement to said drum, a: circumferential series of longitudinally extending guides" also on the periphery of said drum,- in rigid relation to said tooth brush holders and arranged in groups respectively correspondingto the rows on the tooth brushes 111 thewith a frame, of a. carrier, slidably and rota.tably mounted on said frame, a series of brush back holders arranged peripherally of said carrier, means for impartingan axial step-by-step movement to said carrier, a series of peripherally spaced guideways on said carrier extending longitudinally thereof for a distance as great as the total axial movement of said carrier, a; member mounted on said frame and engaging one of said guideways, means for imparting anon-positive rotary movement to SZLlCl carrler, and

means-for momentarily withdrawing; said member from. said guideway whereby said carrier is rotatively advanced until, said,- 1 member engages the achacent' guldeway.

17 In a brush machine, the combination with a frame, of a drum carrier mounted on said frame for rotative and axial, move ments, a series of brush back holders disposed circumferentially thereon, a circumferential series of. guides on said carrier corresponding to the rows of'holes in the brush backs, a detent carried by said frame, means for urging said detent into engagement with one of said guides, means for lmpartlngv step-by-step axial movements tov said drum carrier, means for imparting a torque to said carrier, and means for. momentarily withdrawing said detent from said guide radially of said carrier.

18. In a brush machine, the combination with a movably mounted brush back holder, of a rotatable cam having a series of parallel stepped portions and intermediate inclines, a cam follower engaging said cam and connected to said holder, and means for continuously rotating said cam, whereby said brush back holder is actuated with a stepby-step movement.

19. In a brush machine, the combination with a carrier mounted to be moved in transverse directions, of a rotatable cam for moving said carrier, means for continuously rotating said cam, said cam being provided with a series of parallel steps and intermediate inclines adapted to impart an intermittent movement to said carrier in one direction, a series of peripheral guideways on said carrier and a stop adapted to engage said guideways for guiding said carrier during the movement imparted thereto by said cam. I

20. In a brush machine, the combination with a frame, of a carrier mounted on said frame for axial and rotative movements, means for urging the carrier rotatively, a series of circumferentially spaced brush back holders on the periphery of said car'- rier, a series of circumferentially spaced guides on the periphery of said carrier corresponding to the. number of .longitudinal rows in the brush backs, each guide extending longitudinally in a direction exactly similar to the corresponding row, a detent on said frame engaging one of said guides, means for imparting a step-by-step axial movement to said carrier, and means for intermittently withdrawing said detentto permit step-by-step rotative advancement from row to row.

21. In a brush machine, the combination with a frame, a carrier slidably and rotatably mounted on said frame, a circumferential series of brush back holders on said carrier, means for urging the carrier rotatively, a cam having a series of parallel stepped portions and intermediate inclines, means for continuously rotating said cam, a follower connected to said carrier and cooperating with said cam to impart axial movements to said carrier, a series of circumferentially spaced guides on said car- 'ier corresponding to the rows in the pattern of the brush back, a detent on said frame, means for moving said detent into.

engagement with one of said guides, and means for momentarily withdrawing said detent from said guide radially of said carrier, whereby the latter is rotatively ad vanced until said detent engages the next adjacent guide.

In testimony whereof I aflix my signature.

CONRAD Jo sr. 

